Learning a musical instrument introduces a child to an understanding of music.学一门乐器能引导孩子了解音乐。Stratification does not always work, since it often introduces other conflicts.成层法并非总能解决这类问题, 因为这时常会引起另外的矛盾.This introduces par...
可以给潜水衣充气以增大浮力。Air can be pumped into the diving suit to increase buoyancy.船一定要用有浮力的材料来做.A boat must be made of buoyant material.咸水比淡水浮力大.Salt water has more buoyance than fresh water....